Lukas Tönne
e15cdec2d4
This allows adding a "fake" sun beam effect, simulating crepuscular rays from light being scattered in a medium like the atmosphere or deep water. Such effects can be created also by renderers using volumetric lighting, but the compositor feature is a lot cheaper and is independent from 3D rendering. This makes it ideally suited for motion graphics. The implementation uses am optimized accumulation method for gathering color values along a line segment. The inner buffer loop uses fixed offset increments to avoid unnecessary multiplications and avoids variables by using compile-time specialization (see inline comments for further details).
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
/*
|
|
* Copyright 2014, Blender Foundation.
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version 2
|
|
* of the License, or (at your option) any later version.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software Foundation,
|
|
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
|
|
*
|
|
* Contributor:
|
|
* Lukas Toenne
|
|
*/
|
|
|
|
#ifndef _COM_SunBeamsOperation_h
|
|
#define _COM_SunBeamsOperation_h
|
|
|
|
#include "COM_NodeOperation.h"
|
|
|
|
class SunBeamsOperation : public NodeOperation {
|
|
public:
|
|
SunBeamsOperation();
|
|
|
|
void executePixel(float output[4], int x, int y, void *data);
|
|
|
|
void initExecution();
|
|
|
|
void *initializeTileData(rcti *rect);
|
|
|
|
bool determineDependingAreaOfInterest(rcti *input, ReadBufferOperation *readOperation, rcti *output);
|
|
|
|
void setData(const NodeSunBeams &data) { m_data = data; }
|
|
|
|
private:
|
|
NodeSunBeams m_data;
|
|
|
|
float m_source_px[2];
|
|
float m_ray_length_px;
|
|
};
|
|
|
|
#endif
|